The MMT and Magellan Infrared Spectrograph is a wide-field near-IR imager and multi-object spectrograph built by SAO. MMIRS was commissioned on the MMT in 2009, used on Magellan's 6.5m Clay Telescope for several years, and is now back at the MMT.
http://www.cfa.harvard.edu/mmti/mmirs.html
